In which type of sex determination do both male and female have the same number of chromosomes?

In humans,the inheritance of sex-linked traits takes place through

The first plant in which the chromosomal basis of sex determination was discovered is

The sex of a human child is determined by:

$XO$ type of sex determination can be found in:

Usually,the recessive character is expressed only when present in a double recessive condition. However,a single recessive gene can express itself in human beings when the gene is present on